List directory contents:
ls
Change directory:
cd
Print working directory:
pwd
Create directory:
mkdir
Remove directory:
rmdir
Copy files/directories:
cp
Move/rename files/directories:
mv
Concatenate and display file content:
cat
Create empty file:
touch
Remove files/directories:
rm
Find files in the system:
find
Locate a command:
which
Estimate file space usage:
du
Report file system disk space usage:
df